Interview Questions
Practice the exact questions companies are asking right now.
Questions
9.8k
Companies
511
Updated
08.16.2026
9.8k Questions 511 Companies08.16.2026
PLTCHK
"I got asked a hardcore MCM DP question and I saw it on PracHub as well. Solved that question in 5 minutes. Without PracHub I doubt I could solve it in 5 hours. Though somehow didn't get hired, perhaps I guess I solved it too fast? /s"
_The_TaNk_
"Believe me i'm a student here jn US. Recently interviewed for MSFT. They asked me exact question from PracHub. I saw it the night before and ignored it cause why waste time on random sites. I legit wanna go back and redo this whole thing if I had chance. Not saying will work for everyone but there is certainly some merit to that website. And i'm gonna use it in future prep from now on like lc tagged"
ChrisSenior SWE, LinkedIn
"10 years of experience but never worked at a top company. PracHub's senior-level questions helped me break into FAANG at 35. Age is just a number."
sleepy33
"I was skeptical about the 'real questions' claim, so I put it to the test. I searched for the exact question I got grilled on at my last Meta onsite... and it was right there. Word for word."
JakeSenior ML Engineer, Lyft
"Got a Google recruiter call on Monday, interview on Friday. Crammed PracHub for 4 days. Passed every round. This platform is a miracle worker."
nuggetlord
"I've used LC, Glassdoor, and random Discords. Nothing comes close to the accuracy here. The questions are actually current — that's what got me. Felt like I had a cheat sheet during the interview."
CarlosFull Stack, Shopify
"The solution quality is insane. It covers approach, edge cases, time complexity, follow-ups. Nothing else comes close."
boba.tea.vibes
"Legit the only resource you need. TC went from 180k -> 350k. Just memorize the top 50 for your target company and you're golden."
AndySWE-II, Google
"PracHub Premium for one month cost me the price of two coffees a week. It landed me a $280K+ starting offer."
couchpotato99
"Literally just signed a $600k offer. I only had 2 weeks to prep, so I focused entirely on the company-tagged lists here. If you're targeting L5+, don't overthink it."
ShrutiData Engineer, Salesforce
"Coaches and bootcamp prep courses cost around $200-300 but PracHub Premium is actually less than a Netflix subscription. And it landed me a $178K offer."
midnightramen
"I honestly don't know how you guys gather so many real interview questions. It's almost scary. I walked into my Amazon loop and recognized 3 out of 4 problems from your database."
BiancaFrontend Eng, Figma
"Discovered PracHub 10 days before my interview. By day 5, I stopped being nervous. By interview day, I was actually excited to show what I knew."
tambrahm007
"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."
toa
"The search is what sold me. I typed in a really niche DP problem I got asked last year and it actually came up, full breakdown and everything. These guys are clearly updating it constantly."
Showing 20 results
Role
Medium
Data ScientistMerge seven tables into one clean DataFrame
Using pandas only (no loops over rows), write a function build_facts(customers, orders, order_items, products, payments, shipments, refunds) -> pd.Dat...
Data Manipulation (SQL/Python)
0
0
3 people solved
Oct 13, 2025
Medium
Data ScientistExplain MSE vs MAE, AUC, and imbalance handling
ML interview: losses, metrics, class imbalance, and thresholding Answer all parts concisely and precisely. 1) MAE vs. MSE in regression When would you...
Machine Learning
7
0
54 people solved
Oct 13, 2025
Medium
Data ScientistManipulate and merge DataFrames correctly
Given three pandas DataFrames: customers customer_id, join_date, tier 101, 2025-01-02, gold 102, 2025-02-10, silver 103, 2025-03-05, gold products mod...
Data Manipulation (SQL/Python)
0
0
11 people solved
Oct 13, 2025
Hard
Data Scientist LockedDesign experiment with network and novelty effects
This question evaluates a data scientist's competence in experimental design and causal inference under network interference and novelty effects, cove...
Analytics & Experimentation
4
0
34 people solved
Oct 13, 2025
Hard
Data Scientist LockedDefine success metrics beyond time spent
This question evaluates a data scientist's competency in product analytics and experimentation, focusing on metrics design, cohort-based retention mea...
Analytics & Experimentation
2
0
23 people solved
Oct 13, 2025
Medium
Data ScientistCompute French DAU video-call percentage yesterday
Compute the percentage of daily active users (DAU) from France who were on at least one video call yesterday (2025-08-31 UTC). DAU is defined as users...
Data Manipulation (SQL/Python)
0
0
2 people solved
Oct 13, 2025
Medium
Data ScientistCompute callers contacting >3 people last 7 days
Using the schema below, write a single SQL query to return the number of unique callers who started calls with more than 3 distinct other users during...
Data Manipulation (SQL/Python)
0
0
4 people solved
Oct 13, 2025
Hard
Data ScientistProve causality for trading metric drop
Goal You need to separate market-driven fluctuations from a product-caused decline in executed_trades per active user around a known release on 2025-0...
Statistics & Math
6
0
79 people solved
Oct 13, 2025
Hard
Data ScientistDiagnose sustained drop in executed trades
Brokerage Analytics Troubleshooting: Trades Per Active User Down 22% Context You are the analyst for a brokerage product that spans onboarding through...
Analytics & Experimentation
11
0
91 people solved
Oct 13, 2025
Medium
Data ScientistImplement randomized Quickselect without k-shift bug
Implement randomized Quickselect to return the k-th largest element (1-based k, 1 ≤ k ≤ n) from an unsorted integer array. Use an in-place partition t...
Coding & Algorithms
4
0
47 people solved
Oct 13, 2025
Medium
Data ScientistCompute binary-tree diameter via return-only DFS
Given the root of a binary tree, compute its diameter defined as the number of edges on the longest path between any two nodes. Implement a DFS that r...
Coding & Algorithms
6
0
45 people solved
Oct 13, 2025
Medium
Data ScientistCompute 95th-percentile call concurrency
Given N call sessions as half-open intervals [start, end) in UNIX seconds, design an algorithm to compute the 95th percentile of per-minute concurrent...
Coding & Algorithms
3
0
39 people solved
Oct 13, 2025
Medium
Data ScientistWrite SQL for 7-day WhatsApp call metrics
Today is fixed as 2025-09-01. Using PostgreSQL, write a single query that returns one row per UTC calendar date for the last 7 days inclusive of today...
Data Manipulation (SQL/Python)
0
0
4 people solved
Oct 13, 2025
Medium
Data ScientistWrite SQL for revenue and advertiser analyses
Use the schema below and ANSI SQL. Treat “today” as 2025-09-01. Schema: - active_ads(date DATE, ad_id INT, advertiser_id INT, creation_source VARCHAR,...
Data Manipulation (SQL/Python)
0
0
6 people solved
Oct 13, 2025
Medium
Data ScientistSummarize your background concisely
Behavioral Prompt: 60–90 Second Career Walkthrough (Data Scientist, HR Screen) Context You are interviewing for a Data Scientist role in a consumer-te...
Behavioral & Leadership
5
0
53 people solved
Oct 13, 2025
Hard
Data Scientist LockedBuild and deploy an uplift targeting model
This question evaluates a candidate's ability to design and deploy uplift/causal targeting models, covering causal inference, uplift estimation, pre-t...
Machine Learning
5
0
69 people solved
Oct 13, 2025
Hard
Data ScientistSolve subset-count and kth-factor problems
Two Independent Tasks A) Maximum Count Under Sum Constraint You are given an integer array arr and an integer budget n. Return the maximum number of e...
Coding & Algorithms
4
0
58 people solved
Oct 13, 2025
Medium
Data ScientistUse pandas to aggregate, pivot, and label
Given two pandas DataFrames, write code to: (1) merge and aggregate revenue; (2) produce a 2x2 pivot; (3) compute per-state counts with value_counts, ...
Data Manipulation (SQL/Python)
8
0
143 people solved
Oct 13, 2025
Medium
Data ScientistWrite SQL for dedup and purchase shares
You are given two tables with intentional duplicates. Write SQL to: (a) identify duplicate user_ids and produce a canonical, deduplicated users set; (...
Data Manipulation (SQL/Python)
0
0
8 people solved
Oct 13, 2025
Medium
Data ScientistWrite SQL to analyze Group Calls adoption
Write SQL (assume PostgreSQL) to analyze Group Calls adoption and cannibalization. Use this schema and sample data. Schema: - users(user_id INT PRIMAR...
Data Manipulation (SQL/Python)
0
0
4 people solved
Oct 13, 2025